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[camerax] Implement image capture (flutter#3287)
[camerax] Implement image capture
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121 changes: 121 additions & 0 deletions
121
...oid_camerax/android/src/main/java/io/flutter/plugins/camerax/ImageCaptureHostApiImpl.java
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| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| package io.flutter.plugins.camerax; | ||
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| import android.content.Context; | ||
| import android.util.Size; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.Nullable; | ||
| import androidx.annotation.VisibleForTesting; | ||
| import androidx.camera.core.ImageCapture; | ||
| import androidx.camera.core.ImageCaptureException; | ||
| import io.flutter.plugin.common.BinaryMessenger; | ||
| import io.flutter.plugins.camerax.GeneratedCameraXLibrary.ImageCaptureHostApi; | ||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.util.Objects; | ||
| import java.util.concurrent.Executors; | ||
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| public class ImageCaptureHostApiImpl implements ImageCaptureHostApi { | ||
| private final BinaryMessenger binaryMessenger; | ||
| private final InstanceManager instanceManager; | ||
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| private Context context; | ||
| private SystemServicesFlutterApiImpl systemServicesFlutterApiImpl; | ||
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| public static final String TEMPORARY_FILE_NAME = "CAP"; | ||
| public static final String JPG_FILE_TYPE = ".jpg"; | ||
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| @VisibleForTesting public CameraXProxy cameraXProxy = new CameraXProxy(); | ||
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| public ImageCaptureHostApiImpl( | ||
| @NonNull BinaryMessenger binaryMessenger, | ||
| @NonNull InstanceManager instanceManager, | ||
| @NonNull Context context) { | ||
| this.binaryMessenger = binaryMessenger; | ||
| this.instanceManager = instanceManager; | ||
| this.context = context; | ||
| } | ||
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| /** | ||
| * Sets the context that the {@link ImageCapture} will use to find a location to save a captured | ||
| * image. | ||
| */ | ||
| public void setContext(Context context) { | ||
| this.context = context; | ||
| } | ||
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| /** | ||
| * Creates an {@link ImageCapture} with the requested flash mode and target resolution if | ||
| * specified. | ||
| */ | ||
| @Override | ||
| public void create( | ||
| @NonNull Long identifier, | ||
| @Nullable Long flashMode, | ||
| @Nullable GeneratedCameraXLibrary.ResolutionInfo targetResolution) { | ||
| ImageCapture.Builder imageCaptureBuilder = cameraXProxy.createImageCaptureBuilder(); | ||
| if (flashMode != null) { | ||
| // This sets the requested flash mode, but may fail silently. | ||
| imageCaptureBuilder.setFlashMode(flashMode.intValue()); | ||
| } | ||
| if (targetResolution != null) { | ||
| imageCaptureBuilder.setTargetResolution( | ||
| new Size( | ||
| targetResolution.getWidth().intValue(), targetResolution.getHeight().intValue())); | ||
| } | ||
| ImageCapture imageCapture = imageCaptureBuilder.build(); | ||
| instanceManager.addDartCreatedInstance(imageCapture, identifier); | ||
| } | ||
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| /** Sets the flash mode of the {@link ImageCapture} instance with the specified identifier. */ | ||
| @Override | ||
| public void setFlashMode(@NonNull Long identifier, @NonNull Long flashMode) { | ||
| ImageCapture imageCapture = | ||
| (ImageCapture) Objects.requireNonNull(instanceManager.getInstance(identifier)); | ||
| imageCapture.setFlashMode(flashMode.intValue()); | ||
| } | ||
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| /** Captures a still image and uses the result to return its absolute path in memory. */ | ||
| @Override | ||
| public void takePicture( | ||
| @NonNull Long identifier, @NonNull GeneratedCameraXLibrary.Result<String> result) { | ||
| ImageCapture imageCapture = | ||
| (ImageCapture) Objects.requireNonNull(instanceManager.getInstance(identifier)); | ||
| final File outputDir = context.getCacheDir(); | ||
| File temporaryCaptureFile; | ||
| try { | ||
| temporaryCaptureFile = File.createTempFile(TEMPORARY_FILE_NAME, JPG_FILE_TYPE, outputDir); | ||
| } catch (IOException | SecurityException e) { | ||
| result.error(e); | ||
| return; | ||
| } | ||
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| ImageCapture.OutputFileOptions outputFileOptions = | ||
| cameraXProxy.createImageCaptureOutputFileOptions(temporaryCaptureFile); | ||
| ImageCapture.OnImageSavedCallback onImageSavedCallback = | ||
| createOnImageSavedCallback(temporaryCaptureFile, result); | ||
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| imageCapture.takePicture( | ||
| outputFileOptions, Executors.newSingleThreadExecutor(), onImageSavedCallback); | ||
| } | ||
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| /** Creates a callback used when saving a captured image. */ | ||
| @VisibleForTesting | ||
| public ImageCapture.OnImageSavedCallback createOnImageSavedCallback( | ||
| @NonNull File file, @NonNull GeneratedCameraXLibrary.Result<String> result) { | ||
| return new ImageCapture.OnImageSavedCallback() { | ||
| @Override | ||
| public void onImageSaved(@NonNull ImageCapture.OutputFileResults outputFileResults) { | ||
| result.success(file.getAbsolutePath()); | ||
| } | ||
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| @Override | ||
| public void onError(@NonNull ImageCaptureException exception) { | ||
| result.error(exception); | ||
| } | ||
| }; | ||
| } | ||
| } |
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